| Jamestown Canyon virus | A member of the California group of arboviruses (family Bunyaviridae) which has been associated with a mild febrile illness in humans in North America. (05 Mar 2000) |
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| jamestown weed | <botany> The poisonous thorn apple or stramonium (Datura stramonium), a rank weed early noticed at Jamestown, Virginia. See Datura. This name is often corrupted into jimson, jimpson, and gympsum. Source: Websters Dictionary (01 Mar 1998) |